Re: How does Aikido compare to Aiki-Jujutsu?
Ewen, do you practice Dentokan Jujutsu? Your name seems familiar. Aikido and Hakko-Ryu training methods are fundamentally different. Hakko-Ryu, especially mainline, almost exclusively focuses on paired kata training and is far less "organic" than many of the popular styles of Aikido.
With that being said you're also going to see a large variation in training methods between dojo's that practice offshoots of Hakko-Ryu (like Dentokan and KoKoDo). Our training regularly includes "spirited" jiyuwaza and randori training, while many other Dentokan groups tend to focus more on kihon-waza.
We have some Aikidoka that train with us and there is definitely a benefit in participating in both arts. Jujutsu practitioners can certainly benefit from the movement found in Aikido.
You might try searching for some Roy Dean articles as he has written a bit about training in both Aikido and Seibukan Jujutsu (another off-shoot of Hakko-Ryu).